add description

README.md

@@ -43,9 +43,9 @@ Only projects that are more than a prototype should be added. Projects that do n
 * SQL
   * [wycats/rust-arel](https://github.com/wycats/rust-arel) — an in-progress port of the Ruby SQL building library arel
   * MySql
-    * [blackbeam/rust-mysql-simple](https://github.com/blackbeam/rust-mysql-simple) —  [<img src="https://travis-ci.org/blackbeam/rust-mysql-simple.png?branch=master">](https://travis-ci.org/blackbeam/rust-mysql-simple)
+    * [blackbeam/rust-mysql-simple](https://github.com/blackbeam/rust-mysql-simple) — a native MySql client [<img src="https://travis-ci.org/blackbeam/rust-mysql-simple.png?branch=master">](https://travis-ci.org/blackbeam/rust-mysql-simple)
   * PostgreSql
-      * [sfackler/rust-postgres](https://github.com/sfackler/rust-postgres) —  [<img src="https://travis-ci.org/sfackler/rust-postgres.png?branch=master">](https://travis-ci.org/sfackler/rust-postgres)
+      * [sfackler/rust-postgres](https://github.com/sfackler/rust-postgres) — a native [PostgreSQL](http://www.postgresql.org) client [<img src="https://travis-ci.org/sfackler/rust-postgres.png?branch=master">](https://travis-ci.org/sfackler/rust-postgres)
   * Sqlite
       * [linuxfood/rustsqlite](https://github.com/linuxfood/rustsqlite) — [Sqlite3](http://www.sqlite.org) bindings [<img src="https://travis-ci.org/kud1ing/rustsqlite.png?branch=master">](https://travis-ci.org/kud1ing/rustsqlite)